XL888 is a heat shock protein-90 (HSP90) inhibitor, with an IC50 of 24 nM. For research use only. We do not sell to patients. XL888 Chemical Structure.xl888 login 5 21 Okt 2016 — XL888 has been used in trials studying the treatment of Cancer and Melanoma. Type: Small Molecule; Groups: Investigational; Structure. XL 888 LOGIN Website Aptitude Test Universitas Gunadarma menyediakan informasi dan pendaftaran untuk tes bakat yang wajib bagi mahasiswa sebagai syarat XL888 is an ATP-competitive inhibitor of Hsp90. 2 Through this action, specific client proteins are degraded, resulting in cell cycle arrest or apoptosis.